comunications after the sale !!!!!!

Good man! What most people don't realize is that clicking that "gift" box eliminates the paypal transaction fee, but what it's paying for is your security that the transaction will go as planned. You're basically giving up any rights you might otherwise be entitled to if you mark a payment for goods or services as a Gift.

Good luck with the deal! Hopefully it's just some emergency that arose rather than your seller turning into a flake.